Metro Wastewater Treatment Plant
1200 Simmon Tree Ln, Columbia, SC 29201 · Richland County · Publicly Owned Treatment Works
- Average flow
- 27.08 MGD
- Design flow
- 60 MGD
- NPDES permit
- SC0020940
- Administratively continued
- Permit expires
- May 2023
- Population served
- 314,797
- CWNS 2022
Metro Wastewater Treatment Plant is a publicly owned wastewater treatment works in Columbia, Richland County, South Carolina treating an average of 27.08 million gallons per day against a permitted design capacity of 60 MGD, serving about 314,797 residents. It discharges under NPDES permit SC0020940 (administratively continued), which expires in May 2023, with 7 recorded violations in the last three years. EPA has recorded 1 formal enforcement action naming the plant, the latest in May 2014.
Treatment technology
3 treatment structures and unit processes identified at Metro Wastewater Treatment Plant.
Available with a free Klarifi account
See the full treatment train at Metro Wastewater Treatment Plant: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 7
- Effluent violations
- 7
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
EPA enforcement history
Federal civil enforcement cases, compliance inspections and informal actions recorded for Metro Wastewater Treatment Plant in EPA's ICIS system.
- Formal actions
- 1
- 0 since FY2020
- Penalties assessed
- $476,400
- all cases
- Compliance actions
- $750M
- required by EPA orders
- EPA inspections
- 1
- latest Oct 2009
Latest case · May 2014
COLUMBIA, SC, CITY OF
Judicial case · CWA, NPDES Permit Violations · Final Order With Penalty · Penalty $476,400 · Compliance actions $750M
EPA's description of the case:
“9/9/13?DoJ, EPA, and DHEC announced a proposed settlement today with the City of Columbia to resolve violations of the CWA, including unauthorized overflows of untreated raw sewage. Columbia has…”
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Source: EPA ECHO, civil enforcement case 04-2010-9004.
Full case history with a free Klarifi account
Every action against Metro Wastewater Treatment Plant with dates, milestones, violation types and EPA's complete case summaries, plus inspections and informal actions.
Key contacts
9 verified contacts for Metro Wastewater Treatment Plant, with validated emails and direct phone numbers.
Unlock 9 verified contacts (6 more than shown)
Names, validated emails and direct phone numbers for decision-makers at Metro Wastewater Treatment Plant, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in South Carolina
Columbia · 2 mi away
8.5 MGD
Chapin · 23 mi away
0.99 MGD
Eastover · 23 mi away
0.4 MGD
Ridgeway · 25 mi away
0.08 MGD
Wagener · 29 mi away
0.04 MGD
Lugoff · 29 mi away
0.68 MGD
Camden · 30 mi away
1.73 MGD
Batesburg · 31 mi away
0.8 MGD
Metro Wastewater Treatment Plant: frequently asked questions
Sources and methodology
Flow, permit and violation figures come from the EPA's ICIS-NPDES discharge monitoring records. Population served comes from the Clean Watersheds Needs Survey 2022. Treatment structures are identified by Klarifi's review of aerial imagery, and capital improvement projects are extracted from published municipal budget documents. Violations are counted over the last three years of monitoring reports.
Data refreshed October 26, 2026; facility record last updated March 4, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Biosolids · Filter press · all terms